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Linear representations of algebras and groups, Lie theory, associative algebras, multilinear algebra.

10 votes

Up to date summary on semisimple Hopf algebra over $\mathbb{C}$

This is a question on an active area of research, with lots of work on it (for the general case of algebraically closed fields of char zero). It is historically and conceptually closely connected to K …
Konstantinos Kanakoglou's user avatar
5 votes

Easy example of a non-symmetric braiding of $\operatorname{Rep}(G)$?

Since you mention classification results for $R$-matrices: For finite abelian groups, there is a bijection between the set of universal $R$-matrices of the group hopf algebra $\mathbb C[G]$, the set o …
Konstantinos Kanakoglou's user avatar
1 vote

Symplectic orbits in projective Hilbert spaces are simply connected

I do not have access to the article you are citing but I have made a little search and I think the answer to your question is yes (given that we are speaking about a non-compact, connected, semisimple …
LSpice's user avatar
  • 12.9k
12 votes
Accepted

Semisimple super Lie algebras

Yes there is a complete classification of finite dimensional, simple Lie superalgebras (over $\mathbb{C}$), which -up to a certain extent- goes very much in parallel with the corresponding case of Lie …
Konstantinos Kanakoglou's user avatar
4 votes
Accepted

Representations of $U_q(\mathfrak{sl}(2))$ as differential / difference operators

Although i have some doubts as to what the OP is exactly looking for (see my comments above), i hope that the following will be of some interest for its purposes. In: $U_q(sl(n))$ Difference Operator …
Konstantinos Kanakoglou's user avatar
2 votes

Name for a Hopf algebra admitting no non-trivial 1-dimensional comodule

I am not really sure if this what the OP is looking for but i guess that a closely relevant notion here is that of connected Hopf algebras (i.e HAs which are connected as coalgebras). These are Hopf a …
Konstantinos Kanakoglou's user avatar
1 vote

Representation theory in braided monoidal categories

I will try to provide an answer for a particular case of your last question: Let us consider (following my comment above) the case of $H=\mathbb{CZ}_2$ i.e. the group hopf algebra equipped with its no …
Konstantinos Kanakoglou's user avatar
2 votes

How well is the classification of low-dimensional semisimple Hopf superalgebras (or braided ...

The OP asks more than one different things: the classification of fin dim, semisimple (or not), braided Hopf algebras is still a wide open area (up to my knowledge of course). The classification of …
Konstantinos Kanakoglou's user avatar
2 votes

Classification of $\operatorname{Rep}D(H)$

To any skew-pairing $\lambda:U\otimes H\rightarrow k$, one can associate a hopf algebra $D(U, H)$ (built on $U\otimes H$) which is called the generalized quantum double of $U$ and $H$. (If $H$ is fini …
Konstantinos Kanakoglou's user avatar
4 votes
Accepted

Characters on Hopf algebras

I think that a general example is the so-called Larson's character, which in a sense ties together the trace and determinant functions. To make the long story short: Let $C$ be a cocommutative bial …
Konstantinos Kanakoglou's user avatar
6 votes
Accepted

Classification of $\operatorname{Rep} D(G)$

There are some classic results on the classification of the irreducible $D(G)$-modules: If the field is the complex numbers $\mathbb{C}$, it has been shown that a representation of the finite group $G …
Konstantinos Kanakoglou's user avatar
1 vote

Sufficient conditions for unitarity of a representation of a Lie Superalgebra

If i have correctly understood your question, i think that the answer can be found at M. D. Gould, R. B. Zhang, Classification of all star and grade star irreps of gl(n|1), J. of Math. Phys., 31, 15 …
Konstantinos Kanakoglou's user avatar
8 votes

Mathematical uses of string theory

If the question is set on the level of mentioning important "theorems" or "computations" or "results" which wouldn‘t have been proved without the development of string theory i think one could …
Konstantinos Kanakoglou's user avatar
4 votes
Accepted

Typical and atypical modules for Lie superalgebras

Regarding the "what is happening in the super case"; yes i agree that in some sense, it has to do with the odd simple roots but i think it is deeper than that: In the case of semisimple, complex, Lie …
Community's user avatar
  • 1
11 votes

Limiting representation theory of quantum groups at roots of unity and $SL(2,\mathbb{C})$

This is a very interesting question. I have also made some search but i have not found this result explicitly mentioned somewhere in the literature. However, i remember i have heard such a claim in th …
Konstantinos Kanakoglou's user avatar

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